Mortimer b



(No Model.)

M. B. MILLS. SAFETY VALVE.

Patented June 7, 1892.

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. Nrrn STATES PATENT OFFICE.

MORTIMER B. MILLS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE MILLS IMPROVED PNEUMATIC BRAKE COMPANY, OF SAME PLACE.

SAFETY VALVE,

SPECIFICATION forming part of Letters Patent No. 476,755, dated June 7, 1892.

Application filed August 8, 1891. Serial No. 402,104. (No model.)

To all whom it may concern:

Be it known that I, MORTIMER B. MILLS, a citizen of the United States, residing .at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Safety-Valves, of which the following is a specification.

My invention relates to an improvement in safety-valves, and more particularly to that character of valves designated as pressurereducing valves.

The object of my invention is to improve the construction of valves of this character for the purpose of rendering the operation more certain and to permit the valve to remain in use for a greater period without repair.

With these objects my invention consists in a safety-valve having a high and a low pressure chamber, the passage between which is closed by a puppet-valve controlled by an adjustable spring-regulating device, the opposite ends of the chambers being closed by diaphragms, one or both of which may be made resilient or spring-like in their character to an extent suificient to afford a counterbalance to the weight of the puppet.

The drawing represents a central vertical section through a safety-valve constructed in accordance with my invention, the extreme end of the regulating-handle being shown detached.

A represents the valve-shell, in which two chambers 25 s are formed by the intervening centrally-perforated inflexible diaphragm 9. From the chamber 15 leads out the low-pressure pipe t and from the chamber 3 the highpressure pipe .9. The aperture in the chamber 7' is closed by the puppet-valve B, the stem q of which extends from both faces and through both chambers, and preferably through a guide 1), formed in the high-pressure chamber 8. The outer extremity of the high-pressure chamber 3 is closed bya spring-diaphragm C, to which the rod (1 is centrally secured. The diaphragm C is made, preferably, of spring metal, and the tension of the spring thus afforded is sufficient of itself to sustain the weight of the puppet-valve B with such attached parts as serve to increase the weight normally existing upon the diaphragm. C. The upper end of the low-pressure chamber t is closed by a diaphragm D, which may be made of spring metal, like the diaphragm C, or may be of any of the materials flexible in their nature usually employed in such apparatus. The rod q is centrally secured to the diaphragm D and extends through the same upward. At its upper end the rod passes freely through a pivoted lever E, and between the leverE and the diaphragm the rod is surrounded by a coil adjustable regulating-spring F, the bearings 0 0' of which are pivoted on the lever E and the diaphragm, respectively. The lever E is pivoted at one end in the stud r and at its opposite end carries a spring-pawl m, actuated through a link connected to spring thumb-piece m at the extremity of the handle. A curved upward-extending gage rackbar G is mounted on the valve opposite to the stud n, and'the rack thereon is engaged by the pawl m in the movement of the lever.

The gage upon the rack-bar G is drawn with a view to the tension of the spring F and affords a readily-operated means for adjusting the tension of that spring to a predetermined resistance.

The operation is as follows: The spring F having had its tension adjusted to the predetermined pressure desired in the low-pressure pipe through the medium of the lever E, it is apparent that pressure for this quantity will pass freely from the high-pressure chamber s to the low-pressure chamber t, whereas upon the access of pressure in a predetermined amount the puppet-valve B is closed. The presence of the spring-diaphragm C, besides affording a support normally sufficient to counterbalance the weight of the valve imposed upon it, presents a means for effecting a counter-pressure, which draws down the valve B in proportion as the pressure in the chamber 8 tends to force it upward until this pressure exceeds the adjusted tension of the spring F.

The advantages derived from my construction are principally found in simplicity, uniformity, and certainty of operation, and while it has elements in common with all safetyvalves of the same general character it presents features of desirability which, so far as I am aware, have been lacking in similar devices heretofore existing in the art.

What I claim as new, and desire to secure by Letters Patent, is

A pressure-regulating valve comprisinga shell having its interior divided into a highv and low pressure chamber by a partition having a central opening affording a valve-seat, avalve seating in and operating to close said opening, a valve-stem carryingthe valve and extending from each face thereof to the opposite end of the shell, flexible diaphragrns, to which the stem is fastened, closing the chambers at their outer ends, a regulating device mounted externally to the shell and connected with the stem, and ports leading into the shell at opposite sides of the partition therein, substantially as described.

MORTIMER B. MILLS.

In presence of- J. N. HANSON, M. J. FROST. 

